I find it hard to believe that this design would firm up the mount yet not send a lot of vibration into the car. As Radium King said, the best tradeoff between firmness and vibration is the stock 987 mount.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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